JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2022
·Vol. 26
·期 3
·791-798
·
IF 2.747
Zhao Meiyu,Du Pin,Liu Wei,Du Kaifa,Ma Yongsong,Yin Huayi,Wang Dihua
Making a tantalum carbide (TaC) coating on Ta substrates is an effective way to improve the mechanical and anti-corrosion properties of Ta. However, conventional methods for making a TaC coating require high-temperature conditions of over 1600 °C to get a TaC thickness of > 20 μm. Herein, a TaC coating of > 20 μm thickness was prepared on a Ta substrate in molten CaCl 2 -CaC 2 at 850 °C for 4 h. In the molten salt electrolyzer, the Ta plate served as the anode where C 2 2− was oxidized and simultaneously reacted with Ta to form a TaC layer, and Ca 2+ was reduced and alloyed with C to form CaC 2 that can replenish the C 2 2− . The electrolytic TaC exhibited an average hardness of 962 HV that was 6 times of the bare Ta substrate. In the 3.5 wt% NaCl solution, the TaC coating displayed a higher corrosion potential and lower corrosion current density (0.48 V, 1.59 μA cm −2 ) than Ta substrate (0.35 V, 1.85 μA cm −2 ) and the mixtures of TaC and Ta 2 C (0.35 V, 1.78 μA cm −2 ), indicating its better corrosion resistance. The molten salt anodic carbidation may lead to a general way to prepare transition metal carbide coatings with enhanced carburizing kinetics at < 1000 °C. Graphical abstract
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Shan-Lu Chen,Wei-Ming Guo,Shi-Kuan Sun,Yuji Masubuchi,Ming Lv,Hua-Tay Lin,Cheng-Yong Wang
In this work, nearly single phase SrTaO 2 N powder was directly prepared from strontium carbonate (SrCO 3 ) and tantalum mononitride (TaN), instead of the nitridation of the oxide precursors using NH 3 . The phase evolution and reaction mechanism together with the chemical composition, crystal structure and particle size of SrTaO 2 N product were investigated. Similar to the reactions between SrCO 3 and Ta 3 N 5 , the evolution of CO 2 , CO and N 2 was detected during the reactions. The results revealed that this novel reaction was able to successfully synthesize orange-coloured SrTaO 2 N powder with nearly pure phase at 1200 °C and the powder possessed the uniform size distribution with the mean diameter of 6.63 µm.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2021
·
IF 5.039
Longgong Xia,Xue Wei,Hongjun Wang,Fengchun Ye,Zhihong Liu
The development of tantalum capacitor (TC) industry is associated with the production of one technology metal-tantalum (Ta). The recycling of waste tantalum capacitors (WTCs) is an important strategy for the sustainable development of tantalum related industries. A cryogenic crushing-alkaline calcination-leaching process has been proposed and experimentally studied in the present work, and main results showed: 1) after the refrigeration treatment with liquid nitrogen, WTCs got discharged and became brittle. Three groups of materials could be produced after the milling - magnetic separation - screening treatment, and portions of collected iron-nickel alloy, tantalum wire, and Ta bearing powder were 6.94%, 1.50%, and 91.56%, respectively; 2) organic components in Ta-bearing powder could be efficiently removed in the alkaline calcination process, and Si converted to Na 2 O·mSiO 2 (m = 1, 2), which could be easily leached with water; 3) NaOH was selected to be the alkaline for calcination reactions, and the optimized temperature was 700 °C, the reacting time was 300 min, and the NaOH excess coefficient was 1.0; 4) water leaching residue was treated with nitric acid, and Ag, Fe and Ni could be enriched in the leaching liquor, and the overall recovery of Ta was 96.72% at optimized conditions.
研究领域:
材料科学
·
环境工程
·
冶金学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2025
·
IF 1.6
Liu Zuohai,Li Xiang,Liu Daqian,Weng Xuchen,Huang Min,Liu Zhirong
During the tantalum ore smelting process, radioactive substances such as uranium and thorium accumulate in the slag, posing significant environmental risks if not properly treated. The traditional acid leaching method remains suboptimal for extracting these elements from tantalum slag. To address this limitation, this study employed aluminum salt as leaching aid, effectively enhancing uranium and thorium extraction efficiency. This approach offers a novel methodology for recovering uranium and thorium from refractory slag generated after tantalum ore smelting.
研究领域:
环境科学
·
核化学
·
冶金工程
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Weixuan Zeng,Sheng Cao,Lulu Qiao,Anquan Zhu,Pengfei Tan,Yongjin Ma,Yuan Bian,Rui Dong,Ziyu Wang,Jun Pan
Rationally and skillfully constructing semiconductor heterostructured photocatalysts , benefited from the facilitated the carrier separation and transfer, have attracted intensive attention and been demonstrated as a manageable and effective strategy to develop high-performance photocatalysts. Herein, a novel SrTaO 2 N/Ta 3 N 5 heterostructured photocatalyst were fabricated by one-pot nitridation of Sr 2 Ta 2 O 7 /Ta 2 O 5 precursor under ammonia flow. The as-prepared SrTaO 2 N/Ta 3 N 5 is a type-II heterostructure with an intimate interface contact, and the photocatalytic hydrogen production over the optimized heterostructure SrTaO 2 N(0.1)/Ta 3 N 5 is about 14.1 times higher than that of individual SrTaO 2 N. The experimental results suggest that the formation of type-II heterostructure and intimate interface contact between Ta 3 N 5 and SrTaO 2 N accelerates the separation and transfer of electrons and holes under visible light irradiation, consequently contribute to the improved hydrogen production rate. Moreover, we highlight that one-pot nitridation has the great potential to apply as an underlying general strategy of designing and fabricating other types of high-efficiency tantalum oxynitride-based heterostructured photocatalysts.
研究领域:
材料科学
·
光催化
·
无机化学
·
能源化学
·
半导体物理
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2021
·
IF 3.871
Wenqiang Wang,Fang Peng,Hao Liang,Shixue Guan,Wenjia Liang,Lu Zhang,Mengyang Huang,Yue Tang,Duanwei He
As a highly controversial candidate superhard material, tungsten tetraboride (WB 4 ) has attracted widespread attention due to its desirable mechanical properties . Here, single phase WB 4 ceramics and WB 4 -based materials containing tantalum (Ta) have been successfully synthesized by a high-pressure reaction at 5.0 GPa and 1400 °C - 3000 °C. We systematically investigated the effect of processing temperature on the phase stability of WB 4 and doping with different amounts of Ta on mechanical properties and thermal stability. The results confirm that increasing treatment temperature is beneficial to the synthesis of the WB 4 phase, and high pressure can effectively inhibit the decomposition of WB 4 . Additionally, the hardness value of the WB 4 -based ceramic is found to decrease with the increase of the doped tantalum content. However, the hardness of WB 4 is less than W 0.9 Ta 0.1 B 4 (10 at. % Ta), indicating that a small amount of Ta doping is positive for the mechanical properties of WB 4 . The results show that the W 0.9 Ta 0.1 B 4 ceramic synthesized at a temperature of 2800 °C and 5.0 GPa has excellent overall properties. Its Vickers hardness is 42 GPa (0.49 N), and its oxidation resistance temperature is 542 °C, which is much higher than the hardness and thermal stability of tungsten carbide (WC). This work can provide practical guide for the design of new transition metal boride superhard materials, and point out the visual direction for exploring the next generation of superhard materials.
研究领域:
材料科学
·
固体力学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2023
·
IF 3.6
YongKwan Lee,HyunChul Kim,Namhun Kwon,JaeJin Sim,MiHye Lee,SoongJu Oh,SeokJun Seo,JaeHong Shin,Kyoungtae Park
The Hunter process is predominantly used to manufacture high-purity Ta powder. Among the various physical properties of the Ta powder, its impurity content is particularly crucial. In this study, the process temperature at which a liquid pool of raw material and diluent can be formed and the corresponding amount of diluent were analyzed by performing thermodynamic simulations using FactSage and HSC Chemistry software. Based on the results of the thermodynamic simulations, Ta powder was prepared at process temperatures of 700–800 °C and a specific amount of NaCl at each temperature. Thereafter, the prepared Ta powder was recovered and a post-treatment process was performed to ensure purity. The characteristics of the recovered Ta powder were evaluated according to each process condition by oxygen/nitrogen/hydrogen analysis, scanning electron microscopy/energy-dispersive X-ray spectroscopy, glow discharge-mass spectrometry, and X-ray diffractometry. The synthesized Ta powders were confirmed to exhibit purities >99.95% and oxygen, nitrogen, and hydrogen concentrations of 447, 21, and 10 ppm, respectively. The characterization results indicated that the produced Ta powders were fabricated entirely in a single phase with high purity and recovery rates. Finally, process optimization was achieved for manufacturing high-purity (≥3 N5) Ta powder with controllable impurities.
研究领域:
材料科学
·
冶金学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 8
·3430
·
IF 4.6
Hongtao Guo,Xiaofan Ma,Qiqi Lv,Chunmei Zhang,Gaigai Duan
Compared with traditional metal materials, carbon-based materials have the advantages of low density, high conductivity, good chemical stability, etc., and can be used as reliable alternative materials in various fields. Among them, the carbon fiber conductive network constructed by electrospinning technology has the advantages of high porosity, high specific surface area and rich heterogeneous interface. In order to further improve the conductivity and mechanical properties of pure carbon fiber films, tantalum carbide (TaC) nanoparticles were selected as conductive fillers. The crystallization degree, electrical and mechanical properties of electrospun TaC/C nanofibers at different temperatures were investigated. As the carbonization temperature increases, the crystallization degree and electrical conductivity of the sample also increases, while the growth trend of electrical conductivity is markedly slowed. The best mechanical properties of 12.39 MPa was achieved when the carbonization temperature was 1200 °C. Finally, through comprehensive analysis and comparison, it can be concluded that a carbonization temperature of 1200 °C is the optimum.Keywords:electrospinning;electrical property;pyrolysis temperature;carbonization
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Shichao Zhang,Yong Li,Xinxin Li,Jingjing Gu,Hongwei Shao,Qiang Huang,Peng Cui,Yahua Liu,Jin Ran,Cen-Feng Fu
Two dimensional (2D) TaS 2 laminates have highly regular and ordered transfer mass channels, thus being promising acid recovery membrane candidates for diffusion dialysis (DD) applications to discern H + and metallic ions. However, it remains a daunting task to get access to high-performance 2D acid recycling membranes made from single TaS 2 nanosheets . Here, we report manipulation of the chemical environments of TaS 2 channels to develop excellent acid recycling 2D membranes. As demonstration projects, positively charged poly(diallyldimethylammonium chloride) (PDDA) and poly(4-vinylpyridine) (P4VP) in acid solution were chosen as polycation intercalators to modify the TaS 2 2D channels. Under the DD mode, the TaS 2 membrane exhibits a H + dialysis coefficient (U H + ) of 3.72 × 10 −3 m h −1 and separation factor (S) of 9 towards the simulated acid pickle. In contrast, the U H + and S value of the PDDA@TaS 2 membrane improve to 12.7 × 10 −3 m h −1 and 34.4 respectively. Those of the P4VP@TaS 2 membrane increase to 12.5 × 10 −3 m h −1 and 29.1 respectively. The reported acid recovery properties of PDDA@TaS 2 and P4VP@TaS 2 membranes exceed the commercial DF-120 acid recovery membranes. The experiment and simulation results reveal that the synergistical enhancements of U H + and S originate from the incorporating polycations in PDDA@TaS 2 and P4VP@TaS 2 composite channels.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Yaoyu Ren,Yang Shen,Yuanhua Lin,Ce-Wen Nan
Al-contained Li7–xLa3Zr2–xTaxO12 (xTa-LLZO) powder was synthesized via solid-state reaction, where increasing the Ta doping level was found to reduce the average particle size and facilitate a higher relative density in the sintered pellet. 0.8Ta-LLZO pellets sintered at 1150 °C achieved a relative density of 96.2 ± 0.2% and survived the Li striping/plating test under a unidirectional current polarization of 0.5 mA/cm2 for more than 8 h without short-circuiting. In contrast, other xTa-LLZO sintered pellets with lower Ta doping levels were short-circuited by lithium dendrites after polarization for much shorter time periods. The microstructure of the sintered body played a more essential role in lithium dendrite prevention compared to relative density alone. By characterizing the microstructure of xTa-LLZO sintered pellets, we proposed a formation mechanism of the pathways for lithium dendrite growth.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2020
·Vol. 27
·期 12
·1703-1710
·
IF 1.713
Zhou Jing,Nie Dan-dan,Jin Xian-bo,Xiao Wei
Pyrolysis of the Ta 2 O 5 /melamine mixture in molten chlorides is herein demonstrated as a facile and controllable method to nitridize and functionalize Ta 2 O 5 . The influence of the stoichiometry and composition of Ta 2 O 5 /melamine in molten salts on the nitridation process is rationalized to ensure the controllable preparation of Ta 3 N 5 and Ta 3 N 5 /TaON. The characterization results, including scanning electron microscopy, transmission electron microscopy, elemental mapping, X-ray photoelectron spectroscopy, and photoluminescence spectroscopy, all confirm the existence of the Ta 3 N 5 /TaON heterojunction, in which the TaON nanoparticles are closely anchored to the Ta 3 N 5 nanorods. Benefiting from its composition and structure, the Ta 3 N 5 /TaON composites show enhanced photocatalytic activity for the degradation of methylene blue. The present study highlights that the molten salt method using a solid nitrogen source can be a new technique for rationalizing the design of nitrides and oxynitrides.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
npj Quantum Materials
·
2023
·Vol. 8
·期 1
·1-7
·
IF 5.7
Xu R. Z.,Du X.,Zhou J. S.,Gu X.,Zhang Q. Q.,Li Y. D.,Zhao W. X.,Zheng F. W.,Arita M.,Shimada K.,Kim T. K.,Cacho C.,Guo Y. F.,Liu Z. K.,Chen Y. L.,Yang L. X.
TaTe 4 , a metallic charge-density wave (CDW) material discovered decades ago, has attracted renewed attention due to its rich interesting properties, such as pressure-induced superconductivity and candidate nontrivial topological phase. Here, using high-resolution angle-resolved photoemission spectroscopy and ab initio calculation, we systematically investigate the electronic structure of TaTe 4 . At 26 K, we observe a CDW gap as large as 290 meV, which persists up to 500 K. The CDW-modulated band structure shows a complex reconstruction that closely correlates with the lattice distortion. Inside the CDW gap, there exist highly dispersive energy bands contributing to the remnant Fermi surface and metallic behavior in the CDW state. Interestingly, our ab initio calculation reveals that the large CDW gap mainly opens in the electronic states with out-of-plane orbital components, while the in-gap metallic states originate from in-plane orbitals, suggesting an orbital texture that couples with the CDW order. Our results shed light on the interplay between electron, lattice, and orbital in quasi-one-dimensional CDW materials.
研究领域:
凝聚态物理
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）